It's dangerous to let the children who are _____ go swimming in the river. 
A．too young toB．so youngC．not old enough toD．so old
B
若選A和C,意義不完整,因?yàn)檫@時(shí)let后面缺少了賓語(yǔ)補(bǔ)足語(yǔ).
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